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A139837 as a simple table

na(n)
123
231
347
471
5103
6191
7199
8223
9311
10367
11383
12463
13487
14599
15631
16647
17719
18727
19751
20823
21839
22863
23911
24983
25991
261039
271087
281103
291279
301303
311367
321423
331439
341511
351543
361567
371607
381783
391831
401871
411879
421951
432039
442143
452311
462399

[23,31,47,71,103,191,199,223,311,367,383,463,487,
 599,631,647,719,727,751,823,839,863,911,983,991,
 1039,1087,1103,1279,1303,1367,1423,1439,1511,1543,
 1567,1607,1783,1831,1871,1879,1951,2039,2143,2311,
 2399]